<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .box {
    width: 300px;
    height: 300px;
    background-color: pink;
        }
    </style>
</head>
<body>
    <div class="box"></div>
    <script>
        let box=document.querySelector('.box')
        box.addEventListener('click',function()
        {
            alert('点击了元素')
        })
        box.addEventListener('mouseenter',function()
        {
            alert('鼠标悬停事件触发了')
        })
        box.addEventListener('mouseleave',function()
        {
            alert('鼠标离开事件触发了')
        })
    </script>
</body>
</html>